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A plano convex lens fits exactly into a ...

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different materials refractive indices `mu_(1)` and `mu_(2)` and R is the radius curvature of the curved surface of the lenses, the focal length of the combination is

A

`(R)/(mu_(1)-mu_(2))`

B

`(2R)/(mu_(2)-mu_(1))`

C

`(R)/(2(mu_(1)-mu_(2)))`

D

`(R)/(2-(mu_(1)+mu_(2)))`

Text Solution

Verified by Experts

The correct Answer is:
A
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DC PANDEY-RAY OPTICS-A. Only one option is correct (JEE Advance)
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  2. A prism having an apex angle 4^(@) and refractive index 1.5 is located...

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  4. Optic axis of a thin equiconvex lens is the x-axis. The co-rodinates o...

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  5. A plano convex glass lens (mu(g) = 3//2) of radius curvature R = 10 cm...

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  6. A convex lens of focal length 10 cm is painted black at the middle por...

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  7. A point object is placed on the optic axis of a convex lens of focal l...

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  8. A point object O is placed at a distance of 20 cm from a convex lens o...

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  9. Two thin symmetrical lenses of different nature and of different mater...

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  10. A cubic container is filled with a liquid whose refractive index incre...

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  11. An object is placed at A(OA gt f). Here, f is the focal length of the ...

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  12. The x-z plane separates two media A and B of refractive indices mu(1) ...

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  13. The sides of an isosceles right prism are coated with a reflecting coa...

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  14. A point object is placed at a distance of 20 cm from a glass slab, hal...

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  15. A point source S is placed at a height h from the bottom of a vessel o...

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  16. A point object O is placed slightly above the centre C of a glass sphe...

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  17. In the figure shown, mu(1) gt mu(2) gt mu(3). What are the limits of a...

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  18. A bi-convex lens is cut from the middle as shown in figure. Refractive...

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  19. A hemishperical surface of radius R and refractive index mu = 1.5 is p...

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  20. A ray is travelling along x-axis in negative x-direction. A plane mir...

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